amiga 2091 controller

[23703jim]

i have a 2091 that has 12 mty memory slots. 4 of the slots are installed top row accross.
also says uses 256x4 dram. now with the memory installed 4 accross how much memory shud i have.? these zip chip confuses he hell outta me. now if i install 12 chips to fill the board up how much memory will i have? i have 12 cmos 256x4 zip chips.  does that mean that 4 of these chips equal 256 or each one is 256? plain layman terms please and much thanks

james

[23703jim]

Your board currently has 512kbytes of memory fitted, if you fill the other 12 sockets you will have 2mbytes of ram on that card.
The chips should be numbered 44256 which are 256kx4bits wide so you need 4 chips to fit the 16bit data bus.

the 12 chips i have have on the top "p21014-8" K114A i presume these chips will not work.